PeerBlock
Outstanding
Full user review
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"Generally good protection"
Pros
Appears to be effective in blocking spyware and other malicious intervenors to your system. It was easy to install and the protection options appeared to be straight-forward and easy to select.
Cons
It is NOT effective insofar as blocking anti P2P tracking and intervention. If you're hoping that it will be a solution for this purpose, don't waste your time.
Summary
In general, a good spyware, pop-up and random spam block; not an effective guard when engaging in P2P activity.